diff --git a/server/src/main.rs b/server/src/main.rs
index b4357d5..642feae 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -174,6 +174,7 @@ async fn main()
                 "www/js/const.js",
                 "www/js/language.js",
                 "www/js/util.js",
+                "www/js/badge.js",
                 "www/js/game_asset.js",
                 "www/js/game.js",
                 "www/js/interface.js",
@@ -183,6 +184,7 @@ async fn main()
                 "www/js/main.js",
             ]).ok();
             cache.cache_file("image/png", "/favicon.png", "www/asset/favicon.png").ok();
+            cache.cache_file("image/png", "/favicon_notify.png", "www/asset/favicon_notify.png").ok();
 
             let asset_path = std::path::Path::new("www/asset");
             for asset in [
diff --git a/www/asset/favicon_notify.png b/www/asset/favicon_notify.png
new file mode 100644
index 0000000..ff4e1ba
Binary files /dev/null and b/www/asset/favicon_notify.png differ
diff --git a/www/asset/favicon_notify.svg b/www/asset/favicon_notify.svg
new file mode 100644
index 0000000..41f05e7
--- /dev/null
+++ b/www/asset/favicon_notify.svg
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="120"
+   height="120"
+   viewBox="0 0 120 120"
+   version="1.1"
+   id="svg1"
+   inkscape:version="1.3.2 (091e20e, 2023-11-25, custom)"
+   sodipodi:docname="favicon_notify.svg"
+   inkscape:export-filename="favicon_notify.png"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#111111"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="1"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="px"
+     showgrid="true"
+     inkscape:zoom="4.9208333"
+     inkscape:cx="41.558002"
+     inkscape:cy="30.279424"
+     inkscape:window-width="2588"
+     inkscape:window-height="1368"
+     inkscape:window-x="1257"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="layer1">
+    <inkscape:grid
+       id="grid1"
+       units="px"
+       originx="0"
+       originy="0"
+       spacingx="1"
+       spacingy="1"
+       empcolor="#0099e5"
+       empopacity="0.30196078"
+       color="#0099e5"
+       opacity="0.14901961"
+       empspacing="5"
+       dotted="false"
+       gridanglex="30"
+       gridanglez="30"
+       visible="true" />
+  </sodipodi:namedview>
+  <defs
+     id="defs1" />
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       style="fill:#621313;fill-opacity:1;stroke-width:1.10891"
+       d="M 62.871213,3.4652358 V 16.772189 L 35.148395,36.732618 29.603831,114.35651 H 96.138595 L 90.594031,36.732618 62.871213,16.772189 V 3.4652358 l 44.356507,27.7228182 5.54456,77.623896 -16.633685,11.08913 H 29.603831 l -16.63369,-11.08913 5.544563,-77.623896 z"
+       id="path2-3"
+       sodipodi:nodetypes="ccccccccccccccc" />
+    <path
+       style="fill:#ae5555;fill-opacity:1;stroke-width:1.10891"
+       d="M 59.356512,0.2638065 V 13.57076 L 31.633694,33.531188 26.08913,111.15508 H 92.623894 L 87.07933,33.531188 59.356512,13.57076 V 0.2638065 l 44.356508,27.7228185 5.54456,77.623895 -16.633686,11.08913 H 26.08913 L 9.4554395,105.61052 15.000003,27.986625 Z"
+       id="path2"
+       sodipodi:nodetypes="ccccccccccccccc" />
+    <ellipse
+       style="fill:#ffdb65;fill-opacity:1;stroke-width:1.25"
+       id="path1"
+       cx="75"
+       cy="30"
+       rx="24.999996"
+       ry="25" />
+    <circle
+       style="fill:#fff998;fill-opacity:1;stroke-width:1"
+       id="path1-2"
+       cx="75"
+       cy="30"
+       r="20" />
+  </g>
+</svg>
diff --git a/www/js/badge.js b/www/js/badge.js
index c2435cb..28be812 100644
--- a/www/js/badge.js
+++ b/www/js/badge.js
@@ -1,8 +1,11 @@
-class Badge {
-    
-}
-
-function BADGE_UPDATE()
+function BADGE_UPDATE(notify)
 {
-    
+    let link = document.querySelector("link[rel~='icon']");
+    if(link) {
+        if(notify) {
+            link.href = "/favicon_notify.png";
+        } else {
+            link.href = "/favicon.png";
+        }
+    }
 }
diff --git a/www/js/system.js b/www/js/system.js
index 18cf4bc..3f7cbc3 100644
--- a/www/js/system.js
+++ b/www/js/system.js
@@ -132,6 +132,8 @@ function MESSAGE(event) {
                 index = result.index;
                 STATUS.resume = result.data;
 
+                BADGE_UPDATE(STATUS.challenge > 0 || STATUS.resume > 0);
+
                 UI.update_status();
             }
         } break;